There are essentially two methods of actively managing a running
MySQL Cluster. The first of these is through the use of commands
entered into the management client whereby cluster status can be
checked, log levels changed, backups started and stopped, and nodes
stopped and started. The second method involves studying the
contents of the cluster log
ndb_node_id_cluster.log;
this is usually found in the management server's
DataDir directory, but this location can be
overridden using the LogDestination
option—see Section 15.3.2.4, “Defining a MySQL Cluster Management Server”, for
details. (Recall that node_id represents
the unique identifier of the node whose activity is being logged.)
The cluster log contains event reports generated by
ndbd. It is also possible to send cluster log
entries to a Unix system log.